Why the kernel remove some LSM related functions?

[Wei Chen]

Recent kernel of linux has removed the exported symbol of register_security() for Linux Security Module; so when I want to develop my own security module on 2.6.28, I have to modify the kernel to export the symbol and recompile the kernel source. 

Besides, the kernel has completely removed the functions of mod_reg_security() and mod_unreg_security(), which makes me unable to stack the security module. The only approach is to disable the active security module like SELinux and register mine.

Here, I want to know why the kernel did so. 

Thank you!

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